In this composite of two separate images Tiananmen Square is seen in heavy pollution top on December 1 and 24 hours later under a clear sky on...
{"Image ImageDescription": "BEIJING, CHINA - DECEMBER 02: In this composite of two separate images, Tiananmen Square is seen in heavy pollution, top, on December 1 and 24 hours later under a clear sky on December 2, 2015 in Beijing, China. Until a strong north wind arrived late Tuesday, China's capital and many cities in the northern part of the country recorded the worst smog of the year on November 30 and December 1, 2015 with air quality devices in some areas unable to read such high levels of pollutants. Levels of PM 2.5, considered the most hazardous, crossed 600 units in Beijing, nearly 25 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris this week to set targets on reducing carbon emissions in an attempt to forge a new global agreement on climate change.(Photo by Kevin Frayer/Getty Images)", "Image Copyright": "2015 Getty Images"}